Battery: Shorter than the DS Lite, regardless of brightness setting; for example, the DSi has a battery life of 9–14 hours on the lowest brightness setting, compared to the 15–19 hours of the DS Lite on the same setting. The battery is an 840 mAh internal rechargeable, compared to 1000 mAh for the DS Lite, and has an optimal lifespan of approximately 500 cycles; after this point, it may be replaced by the user."